It also reveals that he entered Syria in the city of Jarabulus having travelled through Turkey and Pakistan and names the recruiter that brought him into the IS fold as Abu Al Taj - Tel Abyad.

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Reyaad Khan

Still from a militant video posted on YouTube of Reyaad Khan, a British citizen fighting for Islamic State (Image: PA)

Khan was 21-years-old when he was killed in an RAF drone strike in Syria in August.

The ex-student had travelled to Syria from Wales in November 2013 and later appeared in a notorious IS propaganda film titled “There is no life without jihad”.

Khan, from Cardiff, was believed to be the brains behind a plan to attack the Queen and other dignitaries at an event in central London.

PM David Cameron said Khan and Hussain had been planning terror attacks on “high profile public commemorations” in Britain this summer and posed a direct threat to the UK.

The pair’s plans are thought to have included an attack on an Armed Forces Day parade in London in June, which was foiled by the security services.

Speaking in the House of Commons Mr Cameron said: "There was nothing to suggest Reyaad Khan would ever leave Syria or desist from his desire to murder us at home.

"We had no way of preventing his planned attacks on our country without taking direct action."

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A picture of a man with a heavy machine gun, believed to be Khan, emerged online soon after his death.

It was taken in the Syrian city of Dier Ezzor, which is occupied by Islamic State ,

Abdel Bary

Abdel-Majed Abdel Bary, son of a suspected al-Qaeda mastermind

Abdel-Majed Abdel Bary, 25, who was once a budding rapper, is thought to be one of 50 ‘disillusioned Westerners’ who are now fleeing the terror fanatics and thought to be somewhere in Turkey.

It is not yet know why he has turned on ISIS – or vice versa – but it is understood he managed to escape by disguising himself as a refugee and crossing the border during the chaos when ISIS retreated from Tal Abyad last month.

He faces death if captured by ISIS and prison if he returns to the UK

Bary joined ISIS two years ago and rose quickly through the ranks.

In August last year he was pictured with the severed head of a man, reportedly in Raqqa.

He turned his back on music to join jihadists

He was brought up in Maida Vale, west London, and his father was believed to have had close connections with Osama bin Laden.

Before he became radicalised he was an aspiring musician and his tracks were even played on BBC Radio 1.

However once ISIS took hold he renounced his musical ambitions for Allah, he has previously said.

He left his family home in 2013 to become a militant and it was believed for a time that he could have been Jihadi John.

Bary uses his Twitter account to post chilling anti-Western rants and has also promised death to all the ‘infidels’ – and ‘beheadings in their own backyard.’